The scientific name of which animal is translated from Greek as "water pig"?

Like a giant Guinea Pig.

Prank, I've seen them in Washington state near Seattle!

alderaanic, I was thinking the exact same thing.

I have seen these immense creatures in Brazil. They can get up to about 175lbs (79 kg I think!) and some 4’ long (1-1/3 m). Impressive!

I would love to see them grazing and playing in the water.